Was dripping a tiny bit of what I thought was oil, up near driver's side front. About 1 teaspoon every 3 days. Took it in to auth Isuzu place- leaking "shift shaft seal". say that 3 times fast! Told me it was transmission fluid leaking, not motor oil. Anybody else have this come up? Is it common, how frequent, etc? 2001, 64k miles (no known service history). Thx!